i had this problem also.. delete cookie history and log in again with the stay logged in box checked and it should take care of the problem...

for some that don't know how to delete cookie history...
Click on Tools on top of the browser
Click on Internet OptionsIn the General Tab click on "Delete Cookies button" under Temporary Internet Files.

OK theres an easier way to do this then to delete all your cookies so you have to login to every site you visit.

Goto START then goto SEARCH then on the left hand side click on FILE AND FOLDERS and just type "pitbulltalk" into the box that asks for file name.

Delete anything that pop up in there that look like a cookie. Unless you have other files on your PC called with "pitbulltalk" in the file name nothing else should show up but your cookie for this site.